\*not emphasized*
\\*emphasis*
\*\*not bold**
\<br/> not a tag
\[link](/foo) not a link
[link](/foo\) "title\"")
\`not code`

1\. not a list item

\* not a list.

\# Not a header

\[foo]: /url "not a reference"

\$ \^ \; can be escaped.
\a \b \T cannot.
unicode letters and symbols cannot: \π \‥.